main.c

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#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/io.h>
 
int main(int argc, char** argv)
{
    for (int i = 1; i < argc; i++)
    {
        fd_t fd = open(argv[i]);
        if (fd == ERR)
        {
            printf("open: failed to open %s (%s)\n", argv[i], strerror(errno));
            return EXIT_FAILURE;
        }
 
        close(fd);
    }
 
    return EXIT_SUCCESS;
}